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79NINE30
 
Join Date: Oct 2007
Posts: 8
930 1 Bar Boost Spring Yes Or No ?

My stock 79/930 runs great and I do not want to modify it much. I have been thinking about installing the 1 bar boost spring but I can not seem to find out anywhere what the performance benefits are and what the downside (if any ) might be. I switched my GHL pipes back to stock because they were so loud but I do notice a loss of power and am hoping this might get some of it back. The only other Mod is a K&n Filter. Thank You for your response.
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Old 04-26-2008, 06:19 PM
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IMO-------- NO.

Added stress on the engine that will shorten its life.
Old 04-26-2008, 06:26 PM
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Why not just add a MBC. Thats what i use, then you can set the wastegate at anything you want and use the spring you already have.
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Old 04-26-2008, 07:09 PM
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79NINE30
 
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What is a MBC ?
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Old 04-26-2008, 07:42 PM
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MBC - Manual Boost Controller

What are your uses for the car?
Track - No way for sure IMO.
Street - Possible if you have a larger intercooler and stay on top of your AFRs. The short bursts should be fine. This is what I currently have and haven't had an issue. USUALLY, the factory is conservative and they set the overboost cut off switch above 1.0bar anyways. I think it's at 1.2.

I have GHL headers, 1.0 bar spring, home made zork, and B&B intercooler and it is very nice. My car is street driven only. If I did track time I'd go back to the .8 spring.

Sorry for the 'long' answer but for your setup I would say NO!
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Old 04-26-2008, 08:22 PM
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For a street car with a larger intercooler like Koklen, I think 1 bar is safe. If you don't increase fuel flow and get the AFR correct, it would probably hole a piston at the track, though.
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Old 04-27-2008, 05:24 AM
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No

No
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Old 04-27-2008, 07:34 AM
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No. Use boost controller (T-orifice, Dawe's device, EBC, whatever) and up it to 0.8-0.9 tops.
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Old 04-27-2008, 12:47 PM
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Quote:
Originally Posted by beepbeep View Post
No. Use boost controller (T-orifice, Dawe's device, EBC, whatever) and up it to 0.8-0.9 tops.
Goran, what's the difference between using a spring vs. a boost controller?
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Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 04-28-2008, 02:54 PM
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Quote:
Originally Posted by 911nut View Post
Goran, what's the difference between using a spring vs. a boost controller?
Boost controller is adaptive and can be adjusted upwards or downwards depending on state of engine or ambient temp. Spring is permanent and requires dissassembly of wastegate bell. Removal of wastegate can sometimes be a frustrating process as things age.

Also, boost controller can only raise boost above the spring-tension controlled boost (often called "base boost").

So keeping a 0.7 bar spring and raising boost additional 0.3 bar with some variant of boost controller is much easier process than disassembling wastegate and fitting 1 bar spring.

There is an issue of harder wastegate spring preventing "wastegate creep". This is debatable issue and my personal opinion is that fitting harder spring to fight wastegate creep is collosal solution to somewhat nonexistant problem. Eventual boost creep can also be fought with EBC that doesn't introduce boost to wastegate bell untill boost reaches preselected value.
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Old 04-28-2008, 03:23 PM
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Quote:
Originally Posted by beepbeep View Post
Boost controller is adaptive and can be adjusted upwards or downwards depending on state of engine or ambient temp. Spring is permanent and requires dissassembly of wastegate bell. Removal of wastegate can sometimes be a frustrating process as things age.
+1 on that. Last week I broke the flange off my J-pipe while trying to remove the OE wastegate.
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'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 04-28-2008, 03:26 PM
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79NINE30
 
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To "MBC" or not to "MBC"

If you ad an MBC does your on board boost gauge still function properly ? Are the MBC's reliable? Easy to install and do you adjust them based on trial and error with the turn of a screw? Thanks
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Old 04-28-2008, 05:34 PM
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Will not stop the gauge in the car from working. They are simple and therefore reliable. There are a few variants.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 05-03-2008, 08:13 AM
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what's the best MBC for track use for custom ECU injected 3.3L 930? hipdoc
Old 05-05-2008, 09:51 PM
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Mine came with a GReedy Profec B Spec II installed, I've got it set to 0.8 max anything else I could hear slight detonation. My recent dyno run confirmed it's optimally set. I'm pretty happy with it, it's got a ton of features and adjustability / programability. I think they're somewhere in the ~ $400 range online.

OE boost gauge still works as well as it "works" (around 0.1 - 0.2 mine just 'sits'), but the EBC also has a built in gauge which can read in psi or bar.

HTH, good luck.
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Old 05-06-2008, 06:00 AM
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These MBC's are very simple.
http://www.3barracing.com/products.htm
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 05-07-2008, 11:46 AM
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Here's another inexpensive brass one...
http://www.boostvalve.com/product.html

Never tried one but I think I'd like to... carefully!
Old 05-07-2008, 12:10 PM
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